Allie,
Thanks for sharing that with us. A few guys at work don't want to jailbreak their phones, and this is certainly a quick and easy way to isolate all email-to-sms messages in a single contact. I'm actually running this way now as well.

Anne,
I do plan on making an Appstore tool that can handle the clearing of all sms, along with a bunch of other features. Once it's in beta, I'll let some of you folks test it out. So much to do, so little time.